Magnetic blow-out arc structure, non-polar direct current arc extinguishing system and circuit breaker

Abstract

The utility model discloses a magnetic blow-out arc structure, a non-polar DC arc extinguishing system and a circuit breaker. The magnetic blow-out arc structure comprises a magnetic conductive member, a first permanent magnet and a second permanent magnet. The magnetic conducting piece comprises a first side wall, a second side wall and a connecting part; the first side wall is parallel to the second side wall; the first side wall and the second side wall are connected through a connecting part to form a U-shaped section with the connecting part as the bottom and the first side wall and the second side wall as two arms. The first permanent magnet is fixedly arranged outside the connecting part, and the first polar surface of the first permanent magnet is in contact with the external surface of the connecting part; the second permanent magnet is located outside the U-shaped opening direction of the magnetic conductive piece, and the first polarity face of the second permanent magnet faces the outer side of the U-shaped opening of the magnetic conductive piece. According to the utility model, the bidirectional non-polar driving of the arc can be realized, so that the advantage that an external magnetic field provides strong driving force for the arc is maintained, and the bidirectional non-polar driving device is simple in structure and easy to realize, and has good application value for the breaking of the non-polar direct-current arc.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances, in particular to a magnetic blow-out arc structure, a non-polarity direct current arc extinguishing system and a circuit breaker. Background Art

[0002] DC circuit breakers are used for switching, distribution and protection of DC power systems. They are important control and protection equipment in DC power distribution systems. DC circuit breakers have high safety and can quickly cut off current in the circuit, effectively preventing overcurrent from damaging electrical equipment, thereby protecting the circuit and ensuring personal safety. In addition, DC circuit breakers have a strong load capacity. Even before the node current reaches the rated value, its load capacity is significantly better than other types of circuit breakers, which makes it have excellent performance in cutting off circuits and preventing overcurrent damage. The arc extinguishing ability of DC circuit breakers is also very outstanding, which helps prevent arcing between contacts from burning out tap switches or short circuits.

[0003] In DC switchgear with positive and negative polarity wiring requirements, the existing technology often uses external permanent magnets to generate directional magnetic fields to enhance the driving force of the arc. The key to the arc breaking of low-voltage switchgear is to achieve the control of arc movement. The external magnetic field can provide sufficient arc driving force, but it has a certain direction, and the driving force generated by the arc or current itself is too small, which limits the improvement of the performance of low-voltage switchgear. Utility Model Content

[0004] In order to solve the problems existing in the prior art, the utility model provides a magnetic blowing arc structure, a non-polarity DC arc extinguishing system and a circuit breaker, which are used to solve the problems in the background technology. The utility model can realize bidirectional non-polarity driving of the arc, thereby maintaining the advantage of the external magnetic field providing a strong driving force for the arc, and solving the problem that the external magnetic field has a definite direction. The structure is simple and easy to implement, and has good application value for the breaking of non-polarity DC arc.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A magnetic blown arc structure comprises a magnetic conductive member, a first permanent magnet and a second permanent magnet;

[0007] The magnetic conductive member comprises a first side wall, a second side wall and a connecting portion;

[0008] The first side wall and the second side wall are parallel to each other; the first side wall and the second side wall are connected by a connecting portion to form a U-shaped cross-section with the connecting portion as the bottom and the first side wall and the second side wall as two arms;

[0009] The first permanent magnet is fixedly arranged outside the connecting part, and the first polarity surface of the first permanent magnet contacts the outer surface of the connecting part; the second permanent magnet is located outside the U-shaped opening direction of the magnetic conductive part, and the first polarity surface of the second permanent magnet faces the outside of the U-shaped opening of the magnetic conductive part.

[0010] Preferably, the polarity of the first polarity plane of the first permanent magnet is different from the polarity of the first polarity plane of the second permanent magnet.

[0011] Preferably, the magnetic conductive member is made of ferromagnetic material.

[0012] Preferably, the first side wall and the second side wall have the same cross-sectional shape, size and thickness.

[0013] Preferably, the first side wall, the second side wall and the connecting portion are an integral structure.

[0014] A non-polarity DC arc extinguishing system, comprising a moving contact, a stationary contact, a moving arc angle, a stationary arc angle, a first arc isolation wall, a second arc isolation wall, an arc extinguishing chamber and a magnetic blown arc structure as described in any one of the above;

[0015] The moving contact moves relative to the static contact to achieve the closing and separation of the moving contact and the static contact; the first side wall and the second side wall of the magnetic conductive member are located on both sides of the moving contact, the static contact, the moving arc angle, and the static arc angle; the first arc isolation wall and the second arc isolation wall are respectively fixedly mounted on the inner surfaces of the first side wall and the second side wall of the magnetic conductive member to isolate the magnetic conductive member from the arc;

[0016] The connecting portion of the magnetic conductive component is located at one end of the moving contact and the static contact away from the arc extinguishing chamber or at one end of the moving contact away from the static contact, the arc extinguishing chamber is located between the static arc angle and the moving arc angle and away from one end of the moving contact and the static contact, the moving contact and the moving arc angle are connected to the same potential through a soft wire, the static contact and the static arc angle are fixedly connected to the same potential, and the second permanent magnet is located on a side of the moving arc angle away from the static arc angle.

[0017] Preferably, the first side wall and the second side wall of the magnetic conductor cover a track formed by the closing and separation of the moving contact relative to the stationary contact.

[0018] Preferably, the second permanent magnet is one permanent magnet or multiple permanent magnets. When there are multiple permanent magnets, the multiple permanent magnets are all arranged on the side of the moving arc angle away from the static arc angle, the first polarity surfaces of the multiple permanent magnets point to the moving arc angle, and the polarity of the first polarity surfaces of the multiple permanent magnets is the same and different from the polarity of the first polarity surface of the first permanent magnet.

[0019] A circuit breaker comprises a magnetic blown arc structure as described in any one of the above items or a non-polarity DC arc extinguishing system as described in any one of the above items.

[0020] Compared with the prior art, the utility model has the following beneficial technical effects:

[0021] The utility model provides a magnetic blowing arc structure. By arranging a magnetic conductive part, a first permanent magnet and a second permanent magnet, the magnetic conductive part is magnetized by the permanent magnet so that the two side walls of the magnetic conductive part show the same polarity to the outside. In combination with the second permanent magnet arranged outside the U-shaped opening direction of the magnetic conductive part, bidirectional non-polarity driving of the arc can be realized, thereby maintaining the advantage of the external magnetic field providing a strong driving force for the arc and solving the problem that the external magnetic field has a definite direction. The utility model has a simple structure, is easy to realize, and has good application value for breaking non-polarity DC arcs.

[0022] The utility model provides a non-polarity DC arc extinguishing system. After the moving and static contacts are separated to generate an arc, the arc will be biased toward the side wall of a magnetizer on one side under the action of a magnetic field component in which the magnetic force lines are directed toward (or in the opposite direction of) the second permanent magnet, and the magnetic field component in which the magnetic force lines near the side wall of the magnetizer are perpendicular to the side wall will promote the arc to move toward the arc extinguishing chamber, thereby realizing bidirectional non-polarity driving of the arc, thereby maintaining the advantage of an external magnetic field providing a strong driving force for the arc, and solving the problem of a definite direction of the external magnetic field. The utility model has a simple structure, is easy to realize, and has good application value for breaking non-polarity DC arcs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a front view of the structure of the non-polarity DC arc extinguishing system in the embodiment of the utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the magnetic conductive member in the embodiment of the utility model;

[0025] Figure 3 This is a three-dimensional diagram of the structure of the non-polarity DC arc extinguishing system in the embodiment of the utility model;

[0026] In the accompanying drawings: 1 is a magnetic conductive member, 11 is a first side wall, 12 is a second side wall, 13 is a connecting portion, 2 is a first permanent magnet, 3 is a second permanent magnet, 4 is a moving contact, 5 is a static contact, 6 is a moving arc angle, 7 is a static arc angle, 81 is a first arc isolation wall, 82 is a second arc isolation wall, and 9 is an arc extinguishing chamber. DETAILED DESCRIPTION

[0027] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present utility model, unless otherwise clearly stipulated and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0033] It should also be understood that the terms used in the utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in the utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0034] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0035] The accompanying drawings show various structural schematic diagrams of the embodiments disclosed in the utility model. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0036] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0037] The utility model discloses a magnetic blowing arc structure, comprising a magnetic conductive part 1, a first permanent magnet 2, and a second permanent magnet 3; the magnetic conductive part 1 comprises a first side wall 11, a second side wall 12 and a connecting portion 13; the first side wall 11 and the second side wall 12 are parallel to each other; the first side wall 11 and the second side wall 12 are connected by the connecting portion 13 to form a U-shaped cross-section with the connecting portion 13 as the bottom and the first side wall 11 and the second side wall 12 as two arms; the first permanent magnet 2 is fixedly arranged outside the connecting portion 13, and the first polarity surface of the first permanent magnet 2 contacts the outer surface of the connecting portion 13; the second permanent magnet 3 is located outside the U-shaped opening direction of the magnetic conductive part 1, and the first polarity surface of the second permanent magnet 3 faces the outside of the U-shaped opening of the magnetic conductive part 1.

[0038] Example 1

[0039] like Figure 1 and Figure 2As shown, a magnetic blow arc structure in an embodiment of the utility model includes a magnetic conductive part 1, a first permanent magnet 2, and a second permanent magnet 3; the magnetic conductive part 1 has a first side wall 11, a second side wall 12, and a connecting portion 13, the first side wall 11, the second side wall 12, and the connecting portion 13 form a U-shaped cross section with the connecting portion 13 as the bottom and the first side wall 11 and the second side wall 12 as two arms, the first permanent magnet 2 is fixedly arranged outside the connecting portion 13, the first polarity surface of the first permanent magnet 2 is in contact with the outer surface of the connecting portion 13, the second permanent magnet 3 is located outside the U-shaped opening direction of the magnetic conductive part 1, and the first polarity surface of the second permanent magnet 3 faces the bottom of the U-shaped opening of the magnetic conductive part 1. In this embodiment, the first polarity surface of the first permanent magnet 2 and the first polarity surface of the second permanent magnet 3 are different in polarity. In this embodiment, the magnetic conductive part 1 is made of ferromagnetic materials such as iron and steel.

[0040] The utility model discloses a magnetic blowing arc structure, which magnetizes the magnetic conductive part by using a permanent magnet so that the two side walls of the magnetic conductive part show the same polarity to the outside, and cooperates with a second permanent magnet arranged outside the U-shaped opening direction of the magnetic conductive part to realize bidirectional non-polarity driving of the arc, thereby maintaining the advantage of the external magnetic field providing a strong driving force for the arc and solving the problem that the external magnetic field has a definite direction. The utility model has a simple structure and is easy to realize, and has a good application value for breaking non-polarity DC arc.

[0041] Example 2

[0042] like Figures 1 to 3 As shown, a non-polarity DC arc extinguishing system in an embodiment of the utility model has any one of the magnetic blowing arc structures described above, and also has a moving contact 4, a stationary contact 5, a moving arc angle 6, a stationary arc angle 7, a first arc isolation wall 81, a second arc isolation wall 82, and an arc extinguishing chamber 9. The moving contact 4 can move relative to the stationary contact 5 to achieve the closing and separation of the moving contact 4 and the stationary contact 5. The first side wall 11 and the second side wall 12 of the magnetic conductive member 1 are located on both sides of the moving contact 4, the stationary contact 5, the moving arc angle 6, and the stationary arc angle 7. The first arc isolation wall 81 and the second arc isolation wall 82 are respectively fixedly mounted on the inner surfaces of the first side wall 11 and the second side wall 12 of the magnetic conductive member 1 to isolate the magnetic conductive member 1 from the arc. The connection of the magnetic conductive member 1 Part 13 is located at the end of the moving contact 4 and the static contact 5 away from the arc extinguishing chamber 9 or at the end of the moving contact 4 away from the static contact 5, the arc extinguishing chamber 9 is located between the static arc angle 7 and the moving arc angle 6, and away from the end of the moving contact 4 and the static contact 5, the moving contact 4 and the moving arc angle 6 are connected to the same potential through a soft wire, the static contact 5 and the static arc angle 7 are fixedly connected to the same potential, and the second permanent magnet 3 is located on the side of the moving arc angle 6 away from the static arc angle 7.

[0043] In this embodiment, the first side wall 11 and the second side wall 12 of the magnetic conductor cover the track formed by the closing and separation of the moving contact 4 relative to the stationary contact 5 .

[0044] In this embodiment, the second permanent magnet 3 is one permanent magnet or multiple permanent magnets. When there are multiple permanent magnets, the multiple permanent magnets are all arranged on the side of the moving arc angle 6 away from the static arc angle 7, and the first polarity surfaces of the multiple permanent magnets face the moving arc angle 6. The polarity of the first polarity surfaces of the multiple permanent magnets is the same and different from the polarity of the first polarity surface of the first permanent magnet 2.

[0045] The first permanent magnet 2 of the magnetic arc blowing structure of the utility model magnetizes the magnetic member 1, so that the two side walls of the magnetic member 1 present the same polarity to the outside, and then cooperates with the second permanent magnet 3 arranged outside the U-shaped opening direction of the magnetic member 1 to form and enhance the magnetic field component parallel to the side wall of the magnetic member 1 and pointing to the second permanent magnet 3, and at the same time, there are magnetic field components perpendicular to the two side walls near the two side walls of the magnetic member 1. After the moving contact 4 and the static contact 5 are separated to generate an arc, the arc will be biased toward the side wall of the magnetic member on one side under the action of the magnetic field component with the magnetic force line facing (or in the opposite direction) to the direction of the second permanent magnet 3, and the magnetic field component with the magnetic force line perpendicular to the side wall near the side wall of the magnetic member on this side will promote the arc to move in the direction of the arc extinguishing chamber 9, so that the bidirectional non-polarity driving of the arc can be realized, thereby maintaining the advantage of the external magnetic field providing a strong driving force for the arc, and solving the problem that the external magnetic field has a certain direction. The structure is simple and easy to implement, and it has a good application value for the breaking of non-polarity DC arc.

[0046] Example 3

[0047] The utility model provides a circuit breaker. The circuit breaker has any one of the magnetic blowing arc structures described in the first embodiment and / or any one of the non-polarity DC arc extinguishing systems described in the second embodiment.

[0048] When the circuit breaker in the embodiment of the utility model cuts off the current, after the moving contact 4 and the static contact 5 separate to generate an arc, the arc will be biased toward the side wall of the magnetizer on one side under the action of the magnetic field component in which the magnetic force lines are directed toward (or in the opposite direction) of the second permanent magnet 3, and the magnetic field component in which the magnetic force lines near the side wall of the magnetizer are perpendicular to the side wall will promote the arc to move toward the arc extinguishing chamber 9, thereby realizing bidirectional non-polarity driving of the arc, thereby maintaining the advantage of the external magnetic field providing a strong driving force for the arc, solving the problem of the external magnetic field having a certain direction, and improving the performance of the low-voltage switch electrical appliance.

[0049] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0050] In addition, it should be understood that although this specification is described in accordance with the implementation methods, not every implementation method contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should take the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the utility model, and cannot be used to limit the protection scope of the utility model. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the utility model shall fall within the protection scope of the claims of the utility model.

Claims

1. A magnetic blown arc structure, characterized in that: It comprises a magnetic conductive member (1), a first permanent magnet (2), and a second permanent magnet (3); The magnetic conductive component (1) comprises a first side wall (11), a second side wall (12) and a connecting portion (13); The first side wall (11) and the second side wall (12) are parallel to each other; the first side wall (11) and the second side wall (12) are connected via a connecting portion (13), forming a U-shaped cross-section with the connecting portion (13) as the bottom and the first side wall (11) and the second side wall (12) as two arms; The first permanent magnet (2) is fixedly arranged outside the connecting portion (13), and a first polarity surface of the first permanent magnet (2) is in contact with an outer surface of the connecting portion (13); the second permanent magnet (3) is located outside the U-shaped opening direction of the magnetic conductive member (1), and a first polarity surface of the second permanent magnet (3) faces the outside of the U-shaped opening of the magnetic conductive member (1).

2. A magnetic blown arc structure according to claim 1, characterized in that: The polarity of the first polarity surface of the first permanent magnet (2) is different from the polarity of the first polarity surface of the second permanent magnet (3).

3. A magnetic blown arc structure according to claim 1, characterized in that: The magnetic conductive member (1) is made of ferromagnetic material.

4. A magnetic blown arc structure according to claim 1, characterized in that: The first side wall (11) and the second side wall (12) have the same cross-sectional shape, size and thickness.

5. A magnetic blown arc structure according to claim 1, characterized in that: The first side wall (11), the second side wall (12) and the connecting portion (13) are an integral structure.

6. A non-polarity DC arc extinguishing system, characterized in that: It comprises a moving contact (4), a stationary contact (5), a moving arc angle (6), a stationary arc angle (7), a first arc isolation wall (81), a second arc isolation wall (82), an arc extinguishing chamber (9), and a magnetic blown arc structure according to any one of claims 1 to 5; The moving contact (4) moves relative to the stationary contact (5) to achieve closing and separation of the moving contact (4) and the stationary contact (5); the first side wall (11) and the second side wall (12) in the magnetic conductive member (1) are respectively located on both sides of the moving contact (4), the stationary contact (5), the moving arc angle (6), and the stationary arc angle (7); the first arc isolation wall (81) and the second arc isolation wall (82) are respectively fixedly mounted on the inner surfaces of the first side wall (11) and the second side wall (12) of the magnetic conductive member (1) to isolate the magnetic conductive member (1) from the arc; The connecting portion (13) in the magnetic conductive member (1) is located at one end of the moving contact (4) and the stationary contact (5) away from the arc extinguishing chamber (9) or at one end of the moving contact (4) facing away from the stationary contact (5); the arc extinguishing chamber (9) is located between the stationary arc angle (7) and the moving arc angle (6) and away from one end of the moving contact (4) and the stationary contact (5); the moving contact (4) and the moving arc angle (6) are connected to the same potential via a soft wire; the stationary contact (5) and the stationary arc angle (7) are fixedly connected to the same potential; and the second permanent magnet (3) is located on a side of the moving arc angle (6) facing away from the stationary arc angle (7).

7. A non-polarity DC arc extinguishing system according to claim 6, characterized in that: The first side wall (11) and the second side wall (12) of the magnetic conductive component cover a track formed by the closing and separation of the moving contact (4) relative to the stationary contact (5).

8. The non-polarity DC arc extinguishing system according to claim 6, characterized in that: The second permanent magnet (3) is one permanent magnet or a plurality of permanent magnets. When there are a plurality of permanent magnets, the plurality of permanent magnets are all arranged on a side of the moving arc angle (6) away from the static arc angle (7), the first polarity surfaces of the plurality of permanent magnets point to the moving arc angle (6), and the polarity of the first polarity surfaces of the plurality of permanent magnets is the same and different from the polarity of the first polarity surface of the first permanent magnet (2).

9. A circuit breaker, characterized in that: It comprises a magnetic blowing arc structure as described in any one of claims 1-5 or a non-polarity DC arc extinguishing system as described in any one of claims 6-8.

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